From my time in China, I know that few Chinese can do the things that Jackie Chan can do. In the same way, not all Americans party every weekend.
Actually, there is a party gland, which secretes hormones that enable young people to party till 2:00 am. It secretes less as you get older, till at about 40 years old, you stop partying altogether. It's sort of like menopause. At 63, I can testify that this is a fact. I went to bed at 10:00 pm on New Year's Eve and let other people celebrate.